Protractor



April! 23, 1935. 9 J. MILLA 1,999,105

PROTRACTORI Filed Dec. 11, 1931 a 10 .0 l a -1.

aZ2! It: J04 I J0 I 7 21 1 J1 E" .17 6 1 0 '1 911 o :1 c :1 j I 7 18 O 0E1 5 I:. I j 7 7 1] .18

JOSEPH MILL r7 INVENTOR I r BY my Maw/v6? ATTORNEY Patented Apr. 23,1935 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to measuring devices.

The invention will be fully and comprehensively understood from aconsideration of the following detailed description when read inconnection with the accompanying drawing which forms part of theapplication with the understanding, however, that the improvement iscapable of extended application and is not confined to the exact showingof the drawing nor to the precise construction described and, therefore,such changes and modifications may be made therefrom as do not affectthe spirit of the invention nor exceed the scope thereof as expressed inthe appended claim.

In the drawing:

Fig. 1 is a plan view of the device or tool.

Fig. 2 is a section taken approximately on the broken line 22, lookingin the direction of the arrows.

Fig. 3 is a perspective view of part of the device shown in Fig. 1.

Fig. 4 is a section taken approximately on the line 4-4 of Fig. 3; and

Fig. 5 is a perspective view of a thread employed in the device.

Fig. 6 is a view taken on line 66 of Fig. 1.

Referring to the drawing for a more detailed description thereof, thenumerals I and 8 indicate two members pivotally connected at 9. Thenumeral I0 indicates a member positioned obliquely to the members I and8 and adjustably secured thereto, being adapted to slide on the membersI and 8 for adjustment. The members I, 8 and III are respectivelyprovided with longitudinal slots Ia, 8a and Ina. to accommodate themovement of screws II and I2 which are employed to hold the members I, 8and It in a desired relative position, the mentioned screws beingprovided respectively with nuts II and I2. The screw I I' passes throughthe slots Mia and Ia while the screw I2 passes through the slots Ita and8a..

The member I carries on its edges scales 'Ib and 7c, the former being onthe outer edge and the latter on the inner edge. The scales lb and loare both divided into inches but the inches have a different number ofsubdivisions. A protractor I5 is fixedly secured to the member I toindicate the angular relationship between the members I and 8. Thisprotractor has degree scales I50. and I512 which run in oppositedirections. The protractor partly rests on the member i and partly on anextension Id of the member I. The member 8, like the member I, isprovided with two different scales, these scales being on the inner andouter edges of the member 8 and respectively numbered 817 and 8c. Themember Ill carries two different scales which are respectively labeledwith the characters Iflb and H10, the edge joining the scale lllb beingpreferably beveled. The scales 8b, 8c, Iflb and I90 are in inches butthe scales of each pair are differently subdivided.

A protractor II, carrying a degree scale I'Ia, is slidable on the memberI, being secured to a member I 8 which is provided with a longitudinalslot I811. The member I8 slides on the back of the member I and isprovided with guides I81) and I which respectively contact with the topand bottom of the member I. Protractor I1 is used in reading the angleof the member I6 and it is apparent that inasmuch as the latter memberis set at different positions relative to the members I and 8, asnecessary, the protractor I! is movable independently of the member I!)so that an edge of the latter member may be set at the middle point ofthe straight edge of the protractor. The screw I I, provided with nut II, passes thru the slots la, la. and HM to adjustably hold together themembers I8, I and Ill, and it has a square shank I la which engages the.edges of the slots I8a and la.

The device described provides for many relative positions between thevarious parts and it is useful to tradesmen, such as carpenters, forexample, in measuring angles so that material may be properly out.

What is claimed as new and useful is:

An instrument of the character described comprising a first elongatedscaled member, a second elongated scaled member pivotally connected tothe first mentioned scaled member, said members having longitudinalslots, a third elongated member in alignment with and adjustablelongitudinally of said second elongated member and positioned back ofthe same and having a longitudinal slot and provided with guidesengaging said second member, a protractor mounted on said third member,a second protractor secured to one of the pivotally connected members toindicate the angle between the latter members, an oblique elongatedscaled member having a longitudinal slot, means for adjustably holdingsaid oblique member to said first member and passing thru thelongitudinal slots of said oblique and first members, and means foradjustably holding together said second, third and oblique members, thelast mentioned means being a screw provided with a nut threadedlyengaging the same, said screw passing thru the slots of said second,third and oblique members and having a squared shank which engages withthe edges of the slots of the second and third members.

JOSEPH MILLA.

